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  1. juancervi

    Birdstrike Analysis, Load on attachment Fasteners

    I have some data on fasteners failing under combined conditions, were can i find some info about how to implement this connector damage in ABAQUS? the DS help doesn`t say to much
  2. juancervi

    Birdstrike Analysis, Load on attachment Fasteners

    Greetings! Currently I'm analyzing birdstrike in external installations added to a FAR 25 aircraft. The approach is ABAQUS Explicit, SPH for the BIRD (EoS, bird ressults validated against AFFDL reports, etc.), elastoplastic behavior of the aircraft structure (Johnson Cook Plasticity, Johnson...
  3. juancervi

    MATLAB - Troubles filtering very noisy signals using narrow pass band filter

    Hello, I am trying to filter a very noisy signal but using a narrow pass band filter there is an undesireded behavior on ressults. While narrower the filter is applied, more signal sections becomes unusable. I apply filters type Chebishev TI and TII, elliptic and Butterworth. The figure...
  4. juancervi

    Fastener load estimation from global FEM

    I have a global wing model, with plate elements for skin, ribs and spars and beam/bar elements for stringers and other longitudinal members. which is the usual way for the estimation of the loads of a group of fasteners on a wing spar panel? should I use the nodal interface loads or estimate...
  5. juancervi

    How to Obtain fastener Load from a simplified plate/beam model of a semimonocoque stucture?

    Hi, I have a model of a semimonocoque structure represented by beam and plate elements (plates represent the skin and frames, and beams the stringers). I would want to know if is there any way of use the membrane forces or stresses in the elements of the joints to estimate the forces into the...
  6. juancervi

    Fastener modelling

    The fastener is suposed to be installed with transition fit, according to NAS 618 (this leads to no interference). I Agree to the idea of a more refined mesh in the hole border, but if i am using RBE2 elements i think that it`s not necessary. What do you mean to "by-passing stress from the...
  7. juancervi

    Fastener modelling

    Hello How can I represent fasteners (Hi lock type) in a structure represented by solid (CTETRA elements)?. The model takes into account the holes for the fasteners. I have used Beam elements connected by rigids (RBE2) to the nodes in the hole surfaces, but it gives very high stress results...

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